export default {
  // 为当前模块开启命名空间
  namespaced: true,
  state: () => ({
    cart: JSON.parse(uni.getStorageSync('cart') || '[]')
  }),
  mutations: {
    addToCart(state, item) {
      const findResult = state.cart.find(x => x.goods_id === item.goods_id)
      if (!findResult) {
        state.cart.push(item)

      } else {
        findResult.goods_count++
      }
      this.commit('m_cart/saveToStorage')
    },
    saveToStorage(state) {
      uni.setStorageSync('cart', JSON.stringify(state.cart))
    },
    // 更新购物车中商品的勾选状态
    updateGoodsState(state, item) {
      const findResult = state.cart.find(x => x.goods_id === item.goods_id)
      if (findResult) {
        findResult.goods_state = item.goods_state

        this.commit('m_cart/saveToStorage')
      }
    },
    // 更新商品数量
    updateGoodsCount(state, item) {
      const findResult = state.cart.find(x => x.goods_id === item.goods_id)
      if (findResult) {
        findResult.goods_count = item.goods_count

        this.commit('m_cart/saveToStorage')
      }
    },
    // 根据id删除对应的商品
    removeGoodsById(state, goods_id) {
      state.cart = state.cart.filter(x => x.goods_id !== goods_id)
      this.commit('m_cart/saveToStorage')
    },
    // 更新选中状态
    updateAllGoodsState(state,newState){
      state.cart.forEach(x => x.goods_state = newState )
      this.commit('m_cart/saveToStorage')
    }

  },
  getters: {
    // 购物车商品总数量
    total(state) {
      return state.cart.reduce((total,item) => total += item.goods_count,0)
    },
    //  已勾选的总数量
    checkedCount(state) {
      return state.cart.filter(x => x.goods_state).reduce((total, item) => total += item.goods_count, 0)
    },
    // 已勾选商品的总价格
    checkedGoodsAmount(state){
      return state.cart.filter(x => x.goods_state).reduce((total,item) => total += item.goods_count * item.goods_price,0).toFixed(2)
    }
  }
}
